1899, Sultan Seyyid Mahommed-bin-Said, ½a-5r, imperforated complete set of 17 plate proofs in horizontal pairs, most with sheet margins, watermark Multiple Rosette, pair of 3a with diagonal ink line on the face, minor reversal soiling, no gum as produced, NH, VF and rare, only a few sets in pairs survived (Image)

1908, Sultan Ali bin Hamoud, imperforated set of 13 (less 25c) plate proofs, watermark Multiple Rosette, no gum as produced, VF and scarce (Image)

1908-09, Palace of the Sultan and Dhow, 50r dull violet and black, two high values, one with ''Specimen'' overprint, full OG, normal stamp is unused, expertly regummed, VF appearance, SG #243, £1,000 (Image)